ISSUE-342: 'text-combine-horizontal' and font features

'text-combine-horizontal' and font features

Current Writing Modes draft says that use of the 'text-combine-horizontal' property disables the use of the 'full-width' value of 'font-variant'. This isn't sufficiently well-specified nor is it necessary in practice. It complicates the font feature authoring model and requires extra logic within implementations without being of much use to authors.